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06 Jun 2018, 04:00
Kudos
Bookmarks
Hi Bunuel,
I have still not able to concrete my understanding of 1st statement.
I get it minimum there would be (atleast) 1 viper. But:-
1) What is the reference of "2 snakes" here , eg- There could be 5 snakes in total and
if we pick a pair one of them would be a viper (atleast) , surely.
2) Why is following condition wrong :-
3V2C :- If we pick a pair then there could be a chance that 2C might be taken, is it because of this we have taken 1C to avoid this kind of situation.
I have still not able to concrete my understanding of 1st statement.
I get it minimum there would be (atleast) 1 viper. But:-
1) What is the reference of "2 snakes" here , eg- There could be 5 snakes in total and
if we pick a pair one of them would be a viper (atleast) , surely.
2) Why is following condition wrong :-
3V2C :- If we pick a pair then there could be a chance that 2C might be taken, is it because of this we have taken 1C to avoid this kind of situation.
08 Jun 2018, 03:16
Kudos
Bookmarks
luffy92
If there are 3 vipers and 2 cobras in the box, the first statement will not be satisfied:
(1) From ANY two snakes from Pandora's box at least one is a viper.
If there are two cobras there, then we could pick two cobras and (1) will not be satisfied.
03 Feb 2019, 13:45
Kudos
Bookmarks
Bunuel
Given: There is at least one viper and at least one cobra in Pandora's box
Target question: How many cobras are there?
Statement 1: From any two snakes from Pandora's box at least one is a viper.
This is indirectly telling us that there is only 1 cobra in the box. Here's why:
If the box contained 2 cobras, then it would be possible to select 2 snakes that are both cobras, which would CONTRADICT statement 1.
If the box contained 3 cobras, then it would be possible to select 2 snakes that are both cobras, which would CONTRADICT statement 1.
If the box contained 4 cobras, then it would be possible to select 2 snakes that are both cobras, which would CONTRADICT statement 1.
. . . etc
So, the box must contain FEWER THAN 2 cobras.
We're told that there is AT LEAST ONE cobra in the box
So, it must be the case that the box contains EXACTLY 1 cobra
Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: The total number of snakes in Pandora's box is 99
There are many scenarios that satisfy statement 2. Here are two:
Case a: The box contains 30 cobras and 69 vipers. In this case, the answer to the target question is the box contains 30 cobras
Case b: The box contains 49 cobras and 50 vipers. In this case, the answer to the target question is the box contains 49 cobras
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT
Answer: A
Cheers,
Brent
